The 2004–05 Dayton Flyers men's basketball team represented the University of Dayton during the 2003–04 NCAA Division I men's basketball season.

The Flyers, led by second year head coach Brian Gregory, played their home games at the University of Dayton Arena and were members of the Atlantic 10 Conference.

[2] The Flyers advanced to the quarterfinals of the Atlantic 10 tournament where their season was ended by Temple.

The Flyers fell to Xavier in the Atlantic 10 tournament championship game.

They received a bid to play in the NCAA tournament where they fell to DePaul in the first round.